Civil War Union Army Officer. He was the son of Governor Andrew Horatio Reeder. He enlisted in the 5th Pennsylvania in October, 1862 and on November 20, 1862, entered the 174 Pennsylvania and was appointed adjutant of his regiment. He served on the staff of Generals Peck and Vodges until August 7, 1863. Born at Easton, May 22d, 1845, son of Andrew H. Reeder and Amalia Hutter. 1855 to 1860, attended school at Lawrenceville, N.J., Allentown, Pa., and Princeton, N.J. 1860 entered the Sophomore class at Princeton College. 1862, while in senior class left College to enlist for the emergency in Pennsylvania, in Fifth Pennsylvania Regiment. In October, 1862, entered the One Hundred and Seventy-fourth Pennsylvania Regiment. November 20th, 1862, appointed Adjutant of his regiment. Served with regiment, and on Staff of Generals Peck and Vogdes, until August 7th, 1863, participating in the active operations of the Tenth and Eighteenth Army Corps in Eastern Virginia and North Carolina, and in the Foster expedition and the movements against Charleston, South Carolina. On being mustered out, began recruiting for Nineteenth Pennsylvania Cavalry. Was commissioned Captain Nineteenth Pennsylvania Cavalry, October 19th, 1863. Served with his regiment and as Judge Advocate of General Grierson’s Cavalry Corps, and as Assistant Adjutant-General, Seventh Division (General Knipe), Wilson’s Cavalry Corps. He took part in the engagements at West Point, Joy Farm, Cypress Swamp, Guntown, Big Black, Port Gibson, Grand Gulf, Coldwater, Oxford, Pilot Knob, Nashville, Hollow Tree Gap, and others. Was slightly wounded at Cypress Swamp, April 2d, 1864. At battle of Nashville was wounded in the right side. Brevetted Major and Lieutenant-Colonel for "gallantry in the battle of Nashville." Mentioned in General Knipe’s official report and recommended for brevet as follows: "Captain Frank Reeder, of my staff, conducted himself with a great deal of bravery, exposing himself, when necessary, with a courage that reflects the greatest credit upon him. During the course of the battle Captain Reeder had three horses shot under him, and was himself wounded in the side. In the second day’s battle he volunteered to lead a charge against a position, from which the charging party had repeatedly failed to dislodge the enemy; this time, however, the position was taken and held. I have the honor to recommend and earnestly urge his promotion by brevet." After the completion of the Nashville campaign, and the recrossing of Hood’s army over the Tennessee River, his regiment was ordered to Mobile, Alabama, to take part in the siege of that place, and Captain Reeder being the senior officer of the regiment, was relieved from staff duty to take command. Commissioned Lieutenant-Colonel, January 26th, 1865. After surrender of General Dick Taylor, commanding the Confederate forces in Albama, Colonel Reeder was ordered with regiment up Red River, to participate in movements against General Kirby Smith. Upon surrender of the Trans-Mississippi forces, was stationed on the Louisiana and Texas borders, until May, 1866. Mustered out at New Orleans, La., May 14th, 1866. Brought his regiment to Philadelphia, where he was finally discharged June 13th, 1866. Upon returning from the army, Colonel Reeder went to Albany, N.Y., to prosecute his law studies. He was admitted to practice March 2d, 1868, and at once located in New York City, where he remained until the autumn of 1869, when he returned to Easton, associating in the practice of his profession with his brother, Hon. H.J. Reeder, under the firm title of Reeder & Reeder. Taking an active interest in politics he was appointed Collector of Internal Revenue for the Eleventh District of Pennsylvania, February 3d, 1873, which position he held until October 1st, 1876. He was appointed Brigadier-General in the National Guard of Pennsylvania, commanding the Fifth Brigade, Second Division, July 22d, 1874.